powerpc/pseries: Add CMO paging statistics

With the addition of Cooperative Memory Overcommitment (CMO) support
for IBM Power Systems, two fields have been added to the VPA to report
paging statistics.  Add support in lparcfg to report them to userspace.

Signed-off-by: Brian King <brking@linux.vnet.ibm.com>
Signed-off-by: Robert Jennings <rcj@linux.vnet.ibm.com>
Acked-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

1 files changed, 20 insertions, 0 deletions

diff --git a/arch/powerpc/kernel/lparcfg.c b/arch/powerpc/kernel/lparcfg.c
index d82e1fa5ce2a..848c3e5a6370 100644
--- a/arch/powerpc/kernel/lparcfg.c
+++ b/arch/powerpc/kernel/lparcfg.c
@@ -409,6 +409,25 @@ static int lparcfg_count_active_processors(void)
         return count;
 }
 
+static void pseries_cmo_data(struct seq_file *m)
+{
+        int cpu;
+        unsigned long cmo_faults = 0;
+        unsigned long cmo_fault_time = 0;
+
+        if (!firmware_has_feature(FW_FEATURE_CMO))
+                return;
+
+        for_each_possible_cpu(cpu) {
+                cmo_faults += lppaca[cpu].cmo_faults;
+                cmo_fault_time += lppaca[cpu].cmo_fault_time;
+        }
+
+        seq_printf(m, "cmo_faults=%lu\n", cmo_faults);
+        seq_printf(m, "cmo_fault_time_usec=%lu\n",
+                   cmo_fault_time / tb_ticks_per_usec);
+}
+
 static int pseries_lparcfg_data(struct seq_file *m, void *v)
 {
         int partition_potential_processors;
@@ -434,6 +453,7 @@ static int pseries_lparcfg_data(struct seq_file *m, void *v)
                 parse_system_parameter_string(m);
                 parse_ppp_data(m);
                 parse_mpp_data(m);
+                pseries_cmo_data(m);
 
                 seq_printf(m, "purr=%ld\n", get_purr());
         } else {                /* non SPLPAR case */